Total reflection based compact near-eye display device with large field of view

ABSTRACT

Disclosed is a total reflection based compact near-eye display device with a large field of view. Light rays emitted by an image source ( 103 ) are transmitted by using a total reflection prism ( 101 ), and are finally subjected to image magnification by means of a near-eye refractive component ( 105 ), such that a near-eye display effect with a large field of view is achieved under the conditions of a compact volume.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application is a continuation application of International PatentApplication No. PCT/CN2020/081049, filed on Mar. 25, 2020, which itselfclaims priority to and the benefit of Patent Application Serial No.CN201910249097.2, filed in China on Mar. 29, 2019. The disclosure ofeach of the above applications is incorporated herein in its entirety byreference.

TECHNICAL FIELD

The application relates to the field of near-eye display devices, inparticular to a compact near-eye display device with a large field ofview angle based on total reflection.

BACKGROUND

In the near-eye display system, in order to form a large field of viewangle display effect, generally, a large-aperture imaging system isneeded, and the focal length of the large-aperture imaging system isgenerally not too small, which represents the axial thickness of thenear-eye display device. Therefore, it is not easy to manufacture a slimand compact glasses display with a large field of view angle under thecurrent industrial situation.

On the basis of keeping the larger aperture of the imaging system, thetotal reflection prism is used to conduct one or more times of totalreflection on the light emitted by the image source, so as to extend thelight propagation path, and finally, the near-eye refractive componentis used for image amplification, thus realizing the near-eye displayeffect with a larger field of view angle, while maintaining the overallsheet shape of the device, which is more suitable for manufacturing thinand portable glasses display products.

SUMMARY

The application provides a compact near-eye display device with a largefield of view angle, which adopts a total reflection prism and anear-eye refractive component and realizes a large field of view angleby means of total reflection conduction and end amplification.

According to the technical scheme of the invention, a compact near-eyedisplay device with a large field angle based on total reflectionutilizes a total reflection prism to conduct one or more times of totalreflection on light emitted by an image source, and finally performsimage amplification through a near-eye refractive component, so that thenear-eye display effect with a large field angle is realized in acompact volume.

Preferably, the primary reflection surface forms an included angle ofabout 30 degrees with the image source, while the secondary reflectionsurface forms an included angle of about 30 degrees with the near-eyerefractive component; the image source and the near-eye refractivecomponent are placed in parallel, and a gap layer exists between theimage source and the near-eye refractive component and the totalreflection prism, and the gap layer contains substances (e.g., air) witha refractive index lower than that of the total reflection prism, sothat light can be totally reflected and transmitted on an inner surfaceof the total reflection prism.

Preferably, the image source is one or more imaging light-emittingdevices selected from a liquid crystal display, a light-emitting diodedisplay, an organic light-emitting diode display, a reflective display,a diffractive light source, a projector, a beam generator, a laser and alight modulator.

Preferably, the near-eye diopter adopts a positive focal length lens, areflective diopter, a polarized bifocal lens, a refractive reflectivediopter or a polarized double reflective diopter.

Preferably, the near-eye refractive component allows external light topass through without diopter, and the secondary reflection surface issemi-reflective (e.g., a semi-reflective film, a polarization splittinglayer or an air layer), so that a human eye can see external environmentthrough the near-eye refractive component and the total reflection prismwhile seeing the displayed image clearly, thereby realizing thesemi-transparent display effect of augmented reality.

Preferably, the total reflection prisms have different shapes, and cangenerate total reflection once, twice or three times in the process oftransmitting light, thereby forming different total reflection opticalsystems.

Preferably, the compensation surface of the total reflection prismfacing away from the near-eye refractive component adopts a curvedsurface (spherical surface, aspheric surface or other curved surfaces),so as to generate a certain refractive power, which can be matched withthe refractive surface of the near-eye refractive component, therebyperforming refractive adjustment on the internal display light and theexternal environment light, and being suitable for users with differenteyesight.

Preferably, the near-eye display device is combined by two sets of totalreflection optical systems, which are respectively placed in front ofhuman eyes, and the two sets of total reflection optical systems projectlight from different directions, and finally, two displayed images arespliced to achieve a larger field of view angle display effect.

Preferably, the near-eye display device adopts the combination of twosets of total reflection optical systems, which are overlapped andplaced in front of human eyes; the polarization states of the two setsof total reflection optical systems are different, and the two paths oflight come from different areas of the same image source,; throughdifferent combinations of polarization splitting layers or polarizationfilters, the optical paths of the two sets of optical systems do notinterfere with each other; finally, the two display images are splicedto achieve a larger field of view angle display effect.

Preferably, the near-eye display device adopts the combination of twosets of total reflection optical systems, which are overlapped andplaced in front of human eyes; the polarization states of the two setsof total reflection optical systems are different, and the two paths oflight come from different times in the same area of the same imagesource (need to be combined with a fast switching polarization filter ora fast switching shutter); through different combinations ofpolarization splitting layers or polarization filters, the optical pathsof the two sets of optical systems do not interfere with each other, andfinally, the two displayed images are spliced to achieve a larger fieldof view angle display effect.

The application has the beneficial effects that the compact near-eyedisplay device with a large field of view angle based on totalreflection is disclosed, and the light emitted by an image source istotally reflected and transmitted for one or more times by a totalreflection prism, and finally the image is amplified by a near-eyerefractive component, so that the near-eye display effect with a largefield of view angle is realized in a compact volume.

It should be understood that both the foregoing general description andthe following detailed description are exemplary illustrations andexplanations, and should not be used as limitations on what is claimedin the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Further objects, functions and advantages of the present applicationwill be elucidated by the following description of embodiments of thepresent application with reference to the accompanying drawings, inwhich:

FIG. 1 schematically shows a structure diagram of a compact near-eyedisplay device with a large field of view angle based on totalreflection;

FIG. 2a to FIG. 2f are specific structural diagrams showing differenttypes of total reflection prisms and near-eye refractive components inthe compact near-eye display device with a large field of view anglebased on total reflection according to the first embodiment of thepresent invention.

FIG. 3a to FIG. 3f are schematic structural diagrams showing differenttypes of total reflection optical systems in the compact near-eyedisplay device with a large field of view angle based on totalreflection according to the second embodiment of the present invention.

FIG. 4a to FIG. 4b are schematic diagrams showing that the totalreflection prism in the compact near-eye display device with a largefield of view angle based on total reflection according to the thirdembodiment of the present application includes a compensation surface.

FIG. 5a to FIG. 5d are schematic diagrams showing that the totalreflection prism in the compact near-eye display device with a largefield of view angle based on total reflection according to the fourthembodiment of the present application does not have a primary reflectionsurface.

FIG. 6a to FIG. 6d are schematic structural views of the near-eyedisplay device according to the fifth embodiment of the presentinvention, which adopts two sets of total reflection optical systemsrespectively combined.

FIG. 7a to FIG. 7c are schematic structural diagrams of a narrow framenear-eye display device which adopts two sets of total reflectionoptical systems (including two total reflections) respectively combinedaccording to the sixth embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a near-eye display devicewhich adopts two sets of total reflection optical systems (includingcurved secondary reflection surfaces) in the seventh embodiment of thepresent invention.

FIG. 9 is a specific structural schematic diagram of a narrow framenear-eye display device which adopts two sets of total reflectionoptical systems (excluding the primary reflection surface) according tothe eighth embodiment of the present invention.

FIGS. 10a to 10b are general schematic diagrams showing the structure ofa narrow frame near-eye display device which adopts two sets of totalreflection optical systems (excluding the primary reflection surface)according to the ninth embodiment of the present invention.

FIG. 11a to FIG. 11b show the structural schematic diagram of thenear-eye display device according to the tenth embodiment of the presentinvention, which adopts the overlapping combination of two sets of totalreflection optical systems (including two total reflections) with lightfrom different regions of the image source.

FIG. 12a to FIG. 12c show the structural schematic diagram of thenear-eye display device according to the eleventh embodiment of thepresent invention, which adopts the overlapping combination of two setsof total reflection optical systems (including multiple totalreflections) with light from different regions of the image source.

FIG. 13a to FIG. 13b show the structural schematic diagram of thenear-eye display device according to the twelfth embodiment of thepresent invention, which adopts the overlapping combination of two setsof total reflection optical systems (including multiple totalreflections) with light rays from the same area of the image source atdifferent times.

DETAILED DESCRIPTION

By referring to exemplary embodiments, the objects and functions of thepresent application and methods for achieving these objects andfunctions will be elucidated. However, the present application is notlimited to the exemplary embodiments disclosed below; It can be realizedin different forms. The essence of the description is only to help thoseskilled in the relevant fields comprehensively understand the specificdetails of the invention.

Hereinafter, embodiments of the present application will be describedwith reference to the drawings. In the drawings, the same referencenumerals represent the same or similar components, or the same orsimilar steps.

FIG. 1 schematically shows a structure diagram of a compact near-eyedisplay device with a large field of view angle based on totalreflection. As shown in FIG. 1, a compact near-eye display device with alarge field of view angle based on total reflection includes a totalreflection prism 101, in which a primary reflection surface 102 forms anangle of about 30 with an image source 103, a secondary reflectionsurface 104 forms an angle of about 30 with a near-eye refractivecomponent 105, and the image source 103 and the near-eye refractivecomponent 105 are placed in parallel with each other. There is a gaplayer 106, and the gap layer 106 contains a substance (such as air) witha refractive index lower than that of the total reflection prism 101, sothat light can be totally reflected and transmitted on the inner surfaceof the total reflection prism 101.

The light emitted from the total reflection prism 101 is magnified bythe near-eye refractive component 105, which can be clearly seen by thehuman eye 107, thus realizing the near-eye display effect with a largefield of view angle in a compact volume.

The image source 103 is a liquid crystal display, a light emitting diodedisplay, an organic light emitting diode display, a reflective display,a diffractive light source, a projector, a beam generator, a laser, alight modulator, etc.

EXAMPLE 1

FIG. 2a to FIG. 2f are specific structural diagrams showing differenttypes of total reflection prisms and near-eye refractive components inthe compact near-eye display device with a large field of view anglebased on total reflection according to the first embodiment of thepresent invention.

In this embodiment, the light emitted by the image source is reflectedby the secondary reflection surface, and then enters the near-eyerefractive component for image amplification, and finally enters thehuman eye, thereby realizing the near-eye display effect with a largefield of view in a compact volume.

As shown in FIG. 2a , the near-eye refractive component may adopt apositive focal length lens 205 a.

As shown in FIG. 2b to FIG. 2e , the near-eye refractive component canallow external ambient light 221 to pass through without diopter, andthe secondary reflection surface is semi-reflective (such assemi-reflective film, polarization splitting layer, or air layer), sothat the human eye can see the external environment through the near-eyerefractive component and total reflection prism while seeing thedisplayed image clearly, thus realizing the semi-transparent displayeffect of augmented reality.

Specifically:

As shown in FIG. 2b , the near-eye diopter can adopt a reflectivediopter 205 b. Preferably, in order to prevent the transmitted light 211after passing through the secondary reflection surface 204 b, it isreflected at the end surface 212, and then reflected by the secondaryreverse surface to enter the human eye again, resulting in stray light.There are the following solutions:

(1) the end face 212 adopts anti-reflection film to prevent light fromreflecting on the inner surface;

(2) the end face 212 adopts a surface treatment method to prevent lightreflection;

(3) an anti-reflection film is added on the near-eye surface 213 toprevent light from being totally reflected on the inner surface, thusavoiding stray light;

(4) the secondary reflection surface 204 b adopts a polarizing beamsplitter, so that the light transmitted through it will still becompletely transmitted when it is reflected back later, and will not bereflected at the secondary reflection surface 204 b; at this time, inorder to ensure that the light reflected by the reflective diopter 205 bcan pass through the secondary reflection surface 204 b, a polarizationchanger (such as a depolarization film, a quarter-wave plate, ahalf-wave plate, a 45-degree polarizing plate, etc., which can changethe linear polarization of the original light) should be added to thereflective diopter 205 b to process the light, and then it can besmoothly reflected into the human eye 207 b.

As shown in FIG. 2c , the near-eye refractive component may adopt apolarized bifocal lens. Said polarization bifocal lens adoptspolarization bifocal lens 205 c with fine structure, which includesorthogonal polarization mixed filter 2051 c and is matched with speciallens with fine structure. There are two different types of A/B surfaceelements mixed on the surface of this special lens, among which:

Class-A surface 20521: if the local refractive index of the finestructure conforms to the refractive law of the short-focus positivelens, the covered small-area polarization filter corresponding to itssurface only allows the display light (which has been processed intopolarized light by the display light polarizer 2031 c) to pass through;

Class-B surface 20522: if the fine structure has no diopter (or onlyslight diopter adapted to the user's vision), the small-areapolarization filter covered on its surface only allows the externalambient light (which has been processed into polarized light by theexternal light polarizer 2211 c) to pass through.

As shown in FIG. 2c 2, there are several examples of the arrangementforms of A/B surface elements: A/B interval ring belt (fresnel-like lensstructure), interval stripes, checkerboard grid, dot matrix (arranged ina large area together with b area with a round and near-round surface ofclass A), A/B interval equilateral triangle array, etc.

In addition, the polarized bifocal lens with diffractive microstructurecan also achieve different focal lengths for light with differentpolarizations (the focal length for internal display light is positiveshort focus, and the focal length for external ambient light is nearlyinfinite).

As shown in FIG. 2d , the near-eye refractive component may adopt arefractive-reflective diopter 205 d. Advantageously, in order to furtherreduce the thickness of the near-eye refractive component, thesemi-reflective surface 2050 d in the figure can be a Fresnel reflectivesurface, or a reflection diffraction microstructure can be adopted torefract the internal display light while allowing the external light topass through without refraction.

As shown in FIG. 2e , the near-eye refractive component can adopt apolarization double-reflection refractive device 205 e. With respect tothe display light emitted by the image source 203 e, after beingprocessed by the display light polarizer 2031 e, it becomes a kind ofpolarized light, which cannot pass directly after entering thepolarization double-reflective diopter 205 e and will be blocked by theend polarization filter 2051 e. The light rays are reflected twice ontwo surfaces of the diopter. Since the two surfaces are not parallel buthave a certain relative curvature, the two reflections bring aboutrefractive magnification (which can make the human eye see clearly). Thelight finally emitted after two reflections can pass through theterminal polarizing filter 2051 e and be seen by the human eye 207 e.

The external ambient light 211 is processed by the external lightpolarizer 2211 e, and becomes another polarized light, which candirectly pass through the end polarization filter 2051 e when enteringthe polarization double-reflection type diopter 205 e. Since there is norefractive reflection and refraction, the human eye 207 e can directlysee the external light. The light is reflected twice on two surfaces ofthe diopter, and is also magnified by refraction (which makes the humaneye unable to see clearly), but it cannot pass through the terminalpolarizing filter 2051 e, so it cannot be seen by the human eye 207 e.

As shown in FIG. 2f , a curved secondary reflection surface 204 f isadopted, which has near-eye refractive function. Therefore, a separatenear-eye refractive component is no longer needed.

EXAMPLE 2

FIG. 3a to FIG. 3f are schematic structural diagrams showing differenttypes of total reflection optical systems in the compact near-eyedisplay device with a large field of view angle based on totalreflection according to the second embodiment of the present invention.

In this embodiment, the total reflection prism 301 has different shapes,and the light emitted by the image source can be totally reflected once,twice, or three times in the process of transmitting the light, therebyforming different total reflection optical systems.

As shown in FIG. 3a , the light is totally reflected twice.

As shown in FIG. 3b , the light is totally reflected three times andreflected by the end reflection surface 308 b.

As shown in FIG. 3c , the light is totally reflected three times andreflected by the end reflection surface 308 c.

As shown in FIG. 3d , the light is totally reflected twice and reflectedby the end reflection surface 308 d.

As shown in FIG. 3e , the light is totally reflected three times andreflected by the end reflection surface 3081 e and the end reflectionsurface 3082 e.

As shown in FIG. 3f , the light is reflected by the reflectingrefractive component 3031 f at the light source end, enlarged orreduced, then transmitted, and then subjected to secondary refraction bythe near-eye refractive component 305 f, finally becoming the light thatcan be seen clearly by human eyes. With this structure, the opticalsystem can be allowed to preprocess the light emitted by the imagesource (for example, enlarging the light can save space and increase thefield of view angle, and reducing the light can improve the definition),thus being more suitable for various use requirements.

EXAMPLE 3

FIG. 4a to FIG. 4b are schematic diagrams showing that the totalreflection prism in the compact near-eye display device with a largefield of view angle based on total reflection according to the thirdembodiment of the present application includes a compensation surface.

The compensation surface is a curved surface, which is located on theside of the total reflection prism facing away from the near-eyerefractive component, and adopts a curved surface (spherical surface,aspheric surface or other curved surfaces) to generate a certaindiopter, which can be matched with the refractive surface of thenear-eye refractive component, thereby performing refractive adjustmenton internal display light and external ambient light and adapting tousers with different eyesight.

As shown in FIG. 4a , a positive focal length lens 405 a is used as anear-eye refractive component, so that the compensation surface 409 ahas a refractive reduction effect on the outer side to counteract therefractive magnification effect of the positive focal length lens 405 a,so that the human eye 407 a can see the outside world clearly.

Preferably, in order to adapt to users with different eyesight, thecurvature of each optical surface can be adjusted or replaced: if thecurvature of the compensation surface 409 a is greater than thecurvature of the refractive surface 4050 a, the external diopter of thewhole optical system is equivalent to a hyperopia lens; if the curvatureof the compensation surface 409 a is smaller than the curvature of therefractive surface 4050 a, the external diopter of the whole opticalsystem is equivalent to a myopia lens.

As shown in FIG. 4b , a refractive-reflective diopter 405 b is used as anear-eye refractive component, so that the compensation surface 409 bhas a refractive reduction effect on the inside to counteract therefractive magnification effect of the refractive-reflective diopter 405b, so that the human eye 407 b can see the outside world clearly.

Preferably, in order to adapt to users with different eyesight, thecurvature of each optical surface can be adjusted or replaced: if thecurvature of the compensation surface 409 b is larger than that of therefractive surface 4050 b, the external diopter of the whole opticalsystem is equivalent to a hyperopia lens; if the curvature of thecompensation surface 409 b is smaller than the curvature of therefractive surface 4050 b, the external diopter of the whole opticalsystem is equivalent to a myopia lens.

Preferably, in order to further reduce the thickness of the near-eyediopter, the positive focal length lens 405 a shown in FIG. 4a may be afresnel lens or a positive focal length diopter with a diffractionmicrostructure; The refractive-reflective diopter 405 b shown in FIG. 4bcan adopt fresnel reflection surface or adopt some reflectiondiffraction microstructure to refract the internal display light underthe condition of allowing the external light to pass through withoutrefraction.

EXAMPLE 4

This embodiment is a modified version of Embodiment 1.

FIG. 5a to FIG. 5d are schematic diagrams showing that the totalreflection prism in the compact near-eye display device with a largefield of view angle based on total reflection according to the fourthembodiment of the present application does not have a primary reflectionsurface.

As shown in FIG. 5a , on the basis of embodiment 1, the primaryreflection surface is removed, the image source 503 a and the secondaryreflection surface 504 a are at about 90 degrees, and the image source503 a and the head-up visual axis 5111 of human eyes are at about 30degrees, and a reflective refractive component 505 a is adopted.Compared with embodiment 1, this scheme has the advantage that the imagesource 503 a can be approximately parallel to the human eye's line ofsight, so that the projection plane of the image source 503 a in thenatural visual angle 540 of the human eye is smaller, and the resultingvisual field blocking area 541 a is also smaller, thus forming a visual“narrow frame” effect.

As shown in FIG. 5b , on the basis of FIG. 5a , a specialrefractive-reflective diopter and compensation surface 509 b are used tomake the refractive structure composed of compensation surface 509 b andreflective inner refractive surface 5051 b refract internally. Therefractive structure composed of the compensation surface 509 b and therefractive external refractive surface 5052 b refracts the externalrefraction. When the diopters of the compensation surface 509 b and therefractive outer refractive surface 5052 b are combined differently, itcan adapt to users with different eyesight.

As shown in FIG. 5c , on the basis of FIG. 5b , the compensation surface509 c with smaller curvature can be used, so that the compensationsurface 509 c can extend close to the image source 503 c, therebyfurther reducing the projection of the opaque surface, forming a smallerview blocking area 541 c, and forming a better “narrow frame” effect.

As shown in FIG. 5d , on the basis of FIG. 5c , the angle between theimage source 503 d and the head-up visual axis 5111 of human eyes isadjusted to be close to 45, and a similar “narrow frame” effect can alsobe achieved.

EXAMPLE 5

FIG. 6a to FIG. 6d are schematic structural views of the near-eyedisplay device according to the fifth embodiment of the presentinvention, which adopts two sets of total reflection optical systemsrespectively combined.

In order to prevent crosstalk between the two sets of optical systems,optical path isolation is set between the two sets of total reflectionprisms. There are four schemes for isolating the optical path:

As shown in FIG. 6a , polarization isolation layer 6041 a is added toblock light crosstalk.

As shown in FIG. 6b , the anti-total reflection surface 6091 b isadopted, such as coating an anti-reflection film on the surface, so thatcrosstalk rays cannot be totally reflected on the inner surface, so theycannot continue to propagate;

As shown in FIG. 6c , two polarization splitting layers 6042 c with thesame properties are adopted, so that after passing through one layer,the light cannot be reflected on the surface of the other layer, butwill be transmitted;

As shown in FIG. 6d , when using the reflective refractive component6051 d, in order to ensure that the light passing through the componentcan pass through the polarization splitting layer 6042 d, it isnecessary to destroy (or change) the polarization of the light; apolarization changer 6050 d (which can be a depolarization film, aquarter-wave plate, a half-wave plate, an inclined 45-degree polarizerand other materials that can change the original linear polarization ofthe light) can be used to process the light, and then it can be smoothlyreflected into the human eye 607 d.

EXAMPLE 6

In this embodiment, two sets of total reflection optical systems arecombined and respectively placed in front of people, that is, thenear-eye display device includes two sets of total reflection prisms andtwo image sources which are respectively placed in front of people. Twosets of total reflection optical systems project light from differentdirections, and finally the two display images are spliced to achieve alarger field of view angle display effect.

FIG. 7a to FIG. 7c are schematic structural diagrams of a narrow framenear-eye display device which adopts two sets of total reflectionoptical systems (including two total reflections) respectively combinedaccording to the sixth embodiment of the present invention.

As shown in FIG. 7a , on the basis of embodiment 5, a total reflectionoptical system structure with twice total reflection is adopted, theprimary reflection surface 702 a is a semi-reflecting structure, and thereflective refractive surface 7051 a is selected, so that the imagesource 703 a is located at one side of the human eye 707 a, through thespecial structural design as shown in the figure, the projection surfaceof the image source 703 a in the human eye field can be made smaller andas far away from the center of the line of sight as possible, resultingin fewer visual field blocking areas 741 a.

As shown in FIG. 7b , on the basis of FIG. 7a , a series of edge displayluminous points 7053 b (which can be LED, OLED or other self-luminous,light-guiding and light-reflecting devices) can be embedded in thetransparent part of the lens to form an edge display luminous pointarray 7054 b, which can display an image matching the central displayarea 743 b. Since the luminous point array is sparse, external light canbe allowed to pass through. The clarity of the displayed image is alsovery low, and the light-emitting source is too close to the human eye,so the display ambiguity is very high. Therefore, it can only be used todisplay very rough edge images and provide an edge-expanded visual fieldarea 742 b, thus expanding the visual perception area of the user andproviding a more immersive visual experience.

As shown in FIG. 7c , the outer surface of the near-eye display devicemay be flat or curved, and the near-eye surface 709 c may be flat orcurved. In order to prevent crosstalk between the light rays of the twosets of optical systems, the near-eye surface 709 c can be set as ananti-total reflection surface. The specific scheme is as follows: addingan anti-reflection film to prevent total reflection of the light rays onthe inner surface, thus blocking the light rays from continuing topropagate; In addition, the combination of polarization splitting layerand polarization changer can also be used for optical path isolation(similar to FIG. 6d ).

EXAMPLE 7

FIG. 8 is a schematic structural diagram of a near-eye display deviceaccording to the seventh embodiment of the present invention, whichadopts two sets of total reflection optical systems (including curvedsecondary reflection surfaces 804).

Preferably, in order to prevent crosstalk between the light rays of thetwo optical systems, an anti-total reflection surface 809 may beprovided.

EXAMPLE 8

FIG. 9 is a specific structural schematic diagram of a narrow framenear-eye display device which adopts two sets of total reflectionoptical systems (excluding the primary reflection surface) according tothe eighth embodiment of the present invention.

As shown in the figure, it is characterized in that, on the basis ofExample 5, the primary reflection surface is removed, the image source903 and the secondary reflection surface 904 (polarization splittinglayer in this embodiment) are at about 90 degrees, the image source 903is at about 30 degrees with the head-up visual axis 9111 of human eyes,the human eyes 907 are about 12 mm away from the optical system, and thecorresponding longitudinal visual angle of the optical system is about96 degrees, so that the edge line of sight 9411 refracted by thecompensation surface 909 (assuming that the refractive index is 1.5, andthe compensation surface 909 is planar) can be approximately parallel tothe image source 903, thereby reducing the projection area of the imagesource 903 in the visual field of human eyes, reducing the visual fieldblocking area 941 of the user, forming a “narrow frame” glasses visualeffect and ensuring the safety of the user. By changing the curvature(diopter) of the compensation surface 909 or the refractive surface9052, the optical system can be adapted to users with differenteyesight.

Similarly, in order to prevent crosstalk between the two sets of opticalsystems, the polarization splitting layer and polarization changer 9050are used to isolate the optical path. In addition, the compensationsurface 909 can also be set as an anti-total reflection surface, forexample, an anti-reflection film is added to prevent the light frombeing totally reflected on the inner surface, thus blocking the lightfrom continuing to propagate.

Similarly, similar to FIG. 7b , edge display luminous point arrays canalso be added on the upper and lower sides of the central display areain this embodiment, so as to expand the visual perception area of theuser.

EXAMPLE 9

FIGS. 10a-10b are general schematic diagrams showing the structure of anarrow frame near-eye display device which adopts two sets of totalreflection optical systems (excluding the primary reflection surface)according to the ninth embodiment of the present invention.

This embodiment is the general case of Embodiment 8. The actualsituation is FIG. 10a , and the abstract relation is FIG. 10 b.

In the near-eye display device, the distance between the human eye andthe optical system is generally 12-25 mm, which is set as d, therefractive index of the material is n, the included angle between theimage source 1003 and the head-up visual axis 10111 of the human eye isá, and the visual angle of the human eye is set as è.

When the following restrictions are met:

arcsin[(sin è/2)/n]≤á<è/2,

from which it can be ensured that the image source 1003 is always insidethe included angle between the inner edge line of sight 10411 and theouter edge line of sight 10412, so that no additional line of sightblocking is generated, and a small field of view blocking area 1041 ismaintained, thus forming a narrow frame glasses visual effect.

Let that include angle between the secondary reflection surface 1004 andthe head-up visual axis 10111 of human eye be â,

when the following restrictions are met:

â=45°+á/2,

It can be ensured that the reflected light 1031 of the secondaryreflection surface is approximately parallel to the head-up visual axis10111 of human eyes.

The distance between the reflected light 1031 formed by the light raysemitted from the center of the image source 1003 in the upper and loweroptical systems is h′, and the width of the image source is h, which hasthe following geometric relationship:

h*cos á=[d*tan(è/2)+h*sin á−h/2/sin á−h′/2]*tan á+[d*tan(è/2)−h′/2]/tanâ

from which it can be introduced that

h*[cos á−tan á*sin á+tan á/2/sin á]=d*tan(è/2)*tan á+d*tan(è/2)/tanâ−h′*[tan á/2+1/2/tan á]

Substituting the actual data, we can calculate h′,

when the following restrictions are met:

0.5h≤h′≤0.85h,

It can ensure that the images displayed by the upper and lower sets ofoptical systems overlap in a small part in the sight of human eyes, andsmooth transition can be realized through the special configuration ofthe two images.

Preferably, h′≈0.85h is considered. The following groups of preferentialparameter configurations can be obtained:

set á=45°, n=1.7, d=15 mm, è=90°, h=16.5, h′=13.5;

or á=45°, n=1.50, d=12 mm, è=75°, h=10, h′=8.41;

or á=30°, n=1.74, d=12 mm, è=100°, h=10.1, h′=8.4;

or á=38°, n=1.60, d=15 mm, è=96°, h=14.3, h′=12.1;

or á=50°, n=1.60, d=15 mm, è=100°, h=23.6, h′=20.3.

EXAMPLE 10

FIG. 11a to FIG. 11b show the structural schematic diagram of thenear-eye display device according to the tenth embodiment of the presentinvention, which adopts the overlapping combination of two sets of totalreflection optical systems (including two total reflections) with lightfrom different regions of the image source.

As shown in FIG. 11a or 11 b, the near-eye display device includes twosets of total reflection prisms (two sets of total reflection opticalsystems), which are combined by two sets of total reflection opticalsystems and placed in front of human eyes; the light polarization statesof the two sets of total reflection optical systems are different(generally, they are two orthogonal linearly polarized lights, which arerepresented by two different types of arrow lines in the figure: “-”.

” and dotted line “

”), the two paths of light come from different areas of the same imagesource 1103, so that the light paths of the two sets of optical systemsdo not interfere with each other through the polarizer 11031 andpolarization filter 11051, and finally the two display pictures arespliced to achieve a larger field of view angle display effect.

Preferably, in order to ensure smooth transition between the two images,the images reflected by the two secondary reflection surfaces 1104should partially overlap, that is, the distance between the twosecondary reflection surfaces 1104 should be smaller than that shown inFIG. 11a or 11 b; or the two secondary reflection surfaces 1104 are notcompletely parallel, but are staggered by a certain angle (for example,5-15 degrees).

EXAMPLE 11

FIG. 12a to FIG. 12c show the structural schematic diagram of thenear-eye display device according to the eleventh embodiment of thepresent invention, which adopts the overlapping combination of two setsof total reflection optical systems (including multiple totalreflections) with light from different regions of the image source.

This embodiment is an improvement of Embodiment 10, which increases thenumber of total reflections and adds a plurality of end reflectionsurfaces 1208.

As shown in the figure, two sets of total reflection optical systems arecombined and placed in front of human eyes; the polarization states ofthe two sets of total reflection optical systems are different(generally, they are two orthogonal linearly polarized lights, which arerepresented by two different types of arrow lines in the figure: “-”.

” and dotted line “

”), the two rays come from different areas of the same image source1203. Through different combinations of polarizer 12031, polarizationsplitting layer 12042, polarization filter 12051 and polarizationchanger 12050, the optical paths of the two sets of optical systems donot interfere with each other, and finally the two display screens arespliced to achieve a larger field of view angle display effect.

EXAMPLE 12

FIG. 13a to FIG. 13b show the structural schematic diagram of thenear-eye display device according to the twelfth embodiment of thepresent invention, which adopts the overlapping combination of two setsof total reflection optical systems (including multiple totalreflections) with light rays from the same area of the image source atdifferent times.

In this embodiment, the near-eye display device includes two sets oftotal reflection prisms (two sets of total reflection optical systems),which are combined by two sets of total reflection optical systems andplaced in front of human eyes; the polarization states of the two setsof total reflection optical systems are different, and the two paths oflight come from different times in the same area of the same imagesource, thus generating two paths of light: FIG. 13a uses a fastswitching polarization filter 13032, and FIG. 13b uses a fast switchingshutter 13033. Through different combinations of polarization splittinglayer 13040 or polarization filter 13051, the optical paths of the twosets of optical systems do not interfere with each other, and finally,the two display pictures are spliced to achieve a larger field of viewangle display effect.

In FIG. 13a , a fast switching polarization filter 13032 is adopted, sothat the light emitted by the image source 1303 a is in two polarizationstates (generally two mutually orthogonal linearly polarized light,which is represented by two different types of arrow lines in thefigure: “-”.

” and the dotted line “

”), in which one polarization state light (with a dash-dot line “

”) only reflects on the surface of the polarization splitting layer13040, but does not transmit. It undergoes total reflection twicedownward, then reflects by the end reflection surface 1308 a, thenpasses through the lower secondary reflection surface 13042 a and entersthe near-eye refractive component 1305 a; it is totally reflected twicedownward, reflected by the end reflecting surface 1308 a, then passesthrough the lower secondary reflecting surface 13042 a and enters thenear-eye refractive component 1305 a through the polarization filter13051. The light with another polarization state (indicated by thedotted line “

”) is only transmitted on the surface of the polarization splittinglayer 13040, but is not reflected; the light ray passes through thelight path adjusting reflecting surface 13081 a, simultaneously passesthrough the polarization changer 13080 a, then is reflected on thesurface of the polarization splitting layer 13040, then is reflectedthrough the end reflecting surface 1308 a, simultaneously passes throughthe polarization changer 13080 a, and then is transmitted through thepolarization splitting layer 13040. At this time, the polarization stateof the light is consistent with the light emitted from the image source,so the light can pass through the upper secondary reflection surface13041 a and then enter the near-eye refractive component 1305 a throughthe polarization filter 13051.

In FIG. 11b , two fast switching shutters 13033 are used, which candetermine whether light can pass through or not by fast switching. At acertain time, the upper fast switching shutter 13033 is opened (thelower fast switching shutter 13033 is closed), and the light emitted bythe image source 1303 b which passes through the polarization splittinglayer 13040 can be reflected by the optical path adjusting reflectionsurface 13081 b (at this time, the polarization of the light haschanged), and then pass through the subsequent optical path similar tothat in FIG. 11a , and enter the near-eye refractive component 13041 bthrough the upper secondary reflection surface 13041 b; at another time,the lower fast switching shutter 13033 is opened (the upper fastswitching shutter 13033 is closed), and the light emitted from the imagesource 1303 b passes through the polarization splitting layer 13040,undergoes total reflection twice downward, can be reflected by the endreflection surface 1308 b (at this time, the polarization of the lighthas changed), and finally enters the near-eye refractive component 13051through the lower secondary reflection surface 13042 b.

Preferably, in FIG. 13a and FIG. 13b , the optical path adjustingreflective surfaces 13081 a and 13081 b are not closely attached to thesurface of the total reflection prism, and their distance needs to bespecially designed; for example, when the refractive index of thematerial is 1.5, the distance is about 0.3 times of the thickness of thetotal reflection prism, so as to ensure that the optical paths of thelight rays of the two optical paths from the image source to thenear-eye refractive component are approximately the same and the imagingplanes are consistent.

Combined with the description and practice of the application disclosedherein, other embodiments of the application will be easily thought ofand understood by those skilled in the art. The description and examplesare to be regarded as exemplary only, and the true scope and spirit ofthe application are defined by the claims.

What is claimed is:
 1. A compact near-eye display device with a largefield of view angle based on total reflection, comprising: a totalreflection prism for totally reflecting and conducting light emitted byan image source for one or more times, a near-eye refractive componentfor enlarging the image after one or more reflections of the light. 2.The near-eye display device according to claim 1, wherein the totalreflection prism comprises a primary reflection surface and a secondaryreflection surface, the primary reflection surface forms an includedangle of about 30 degrees with the image source, while the secondaryreflection surface forms an included angle of about 30 degrees with thenear-eye refractive component; the image source and the near-eyerefractive component are placed in parallel, and a gap layer existsbetween the image source and the near-eye refractive component and thetotal reflection prism, and the gap layer contains substances with arefractive index lower than that of the total reflection prism, so thatlight can be totally reflected and transmitted on an inner surface ofthe total reflection prism.
 3. The near-eye display device according toclaim 1, wherein the image source is one or more imaging light-emittingdevices selected from a liquid crystal display, a light-emitting diodedisplay, an organic light-emitting diode display, a reflective display,a diffractive light source, a projector, a beam generator, a laser and alight modulator.
 4. The near-eye display device according to claim 1,wherein the near-eye diopter adopts a positive focal length lens, areflective diopter, a polarized bifocal lens, a refractive reflectivediopter or a polarized double reflective diopter.
 5. The near-eyedisplay device according to claim 4, wherein the near-eye refractivecomponent allows external light to pass through without diopter, and thesecondary reflection surface is semi-reflective, so that a human eye cansee external environment through the near-eye refractive component andthe total reflection prism while seeing the displayed image clearly. 6.The near-eye display device according to claim 1, wherein the totalreflection prism comprises a compensation surface, the compensationsurface is a curved surface and is located on a side of the totalreflection prism facing away from the near-eye refractive component, andthe refractive surface of the near-eye refractive component is matchedto perform refractive adjustment on internal display light and externalenvironmental light.
 7. The near-eye display device according to claim1, wherein the device comprises two sets of total reflection prisms andtwo image sources, the two sets of total reflection prisms and two imagesources are respectively placed in front of the human eyes, projectlight from different directions, and splice two displayed pictures toachieve a larger field of view angle display effect.
 8. The near-eyedisplay device according to claim 7, wherein optical path isolation isarranged between the two sets of total reflection prisms.
 9. Thenear-eye display device according to claim 1, wherein the devicecomprises two sets of total reflection prisms, the two sets of totalreflection prisms are overlapped and placed in front of the human eyes,and two paths of light from different areas of the same image source arespliced by two displayed pictures to achieve a larger field of viewangle display effect.
 10. The near-eye display device according to claim1, wherein the device comprises two sets of total reflection prisms, thetwo sets of total reflection prisms are placed in front of the humaneyes, and two paths of light at different times from the same area ofthe same image source are spliced by two displayed pictures to achieve alarger field of view angle display effect.